a dull sound, as of a heavy blow or fall.
a blow causing such a sound.
verb (used without object), thudded, thudding.
to strike or fall with a dull sound of heavy impact.

1505–15; imitative; compare Middle English thudden, Old English thyddan to strike, press

thuddingly, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thud (θʌd)
1.  a dull heavy sound: the book fell to the ground with a thud
2.  a blow or fall that causes such a sound
vb , thuds, thudding, thudded
3.  to make or cause to make such a sound
[Old English thyddan to strike; related to thoddettan to beat, perhaps of imitative origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

O.E. þyddan "to strike, thrust," of imitative origin. Sense of "hit with a dull sound" first recorded 1796. The noun is attested from 1513.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

thud definition

1. Yet another metasyntactic variable (see foo). It is reported that at CMU from the mid-1970s the canonical series of these was "foo", "bar", "thud", "blat".
2. Rare term for the hash character, "#" (ASCII 35). See ASCII for other synonyms.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
The hissing and crackling behind me, the explosive thud as each fresh tree
  burst into flame, left little time for reflection.
Many seconds later came the sound, which varied from a dull thud to a sharp
As she prepared to leave for work, she heard a thud.
The salad, topped with walnuts and a mustard vinaigrette, lands with a thud and
  disappears in a whisper.
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